This is most probably lower ball joint. Jack the car up enough to get your head under there. Put a axle stand in for safety. Then get somebody to turn the steering and you should be able to listen to where its coming from. If not a garage might just diagnose for free if you have used them on a regular basis.

The're pressed in and you have to take the whole knuckle off the car to get at it.

The way to test the lower ball joint is not to jack the car up at all, put a long screwdriver or a pry bar between the lower arm and the knuckle and lever it slightly whilst the weight of the car is on it. If there is any movement the ball joint will need replacing.